<script language="javascript">

/*
Password Strength Algorithm:

Password Length:
5 Points: Less than 4 characters
10 Points: 5 to 7 characters
25 Points: 8 or more

Letters:
0 Points: No letters
10 Points: Letters are all lower case
20 Points: Letters are upper case and lower case

Numbers:
0 Points: No numbers
10 Points: 1 number
20 Points: 3 or more numbers

Characters:
0 Points: No characters
10 Points: 1 character
25 Points: More than 1 character

Bonus:
2 Points: Letters and numbers
3 Points: Letters, numbers, and characters
5 Points: Mixed case letters, numbers, and characters

Password Text Range:

>= 90: Very Secure
>= 80: Secure
>= 70: Very Strong
>= 60: Strong
>= 50: Average
>= 25: Weak
>= 0: Very Weak

*/

// Settings
// -- Toggle to true or false, if you want to change what is checked in the password
var m_strUpperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
var m_strLowerCase = "abcdefghijklmnopqrstuvwxyz";
var m_strNumber = "0123456789";
var m_strCharacters = "!@#$%^&*?_~"

// Check password
function checkPassword(strPassword)
{
// Reset combination count
var nScore = 0;

// Password length
// -- Less than 4 characters
if (strPassword.length < 5)
{
nScore += 5;
}
// -- 5 to 7 characters
else if (strPassword.length > 4 && strPassword.length < 8)
{
nScore += 10;
}
// -- 8 or more
else if (strPassword.length > 7)
{
nScore += 25;
}

// Letters
var nUpperCount = countContain(strPassword, m_strUpperCase);
var nLowerCount = countContain(strPassword, m_strLowerCase);
var nLowerUpperCount = nUpperCount + nLowerCount;
// -- Letters are all lower case
if (nUpperCount == 0 && nLowerCount != 0)
{
nScore += 10;
}
// -- Letters are upper case and lower case
else if (nUpperCount != 0 && nLowerCount != 0)
{
nScore += 20;
}

// Numbers
var nNumberCount = countContain(strPassword, m_strNumber);
// -- 1 number
if (nNumberCount == 1)
{
nScore += 10;
}
// -- 3 or more numbers
if (nNumberCount >= 3)
{
nScore += 20;
}

// Characters
var nCharacterCount = countContain(strPassword, m_strCharacters);
// -- 1 character
if (nCharacterCount == 1)
{
nScore += 10;
}
// -- More than 1 character
if (nCharacterCount > 1)
{
nScore += 25;
}

// Bonus
// -- Letters and numbers
if (nNumberCount != 0 && nLowerUpperCount != 0)
{
nScore += 2;
}
// -- Letters, numbers, and characters
if (nNumberCount != 0 && nLowerUpperCount != 0 && nCharacterCount != 0)
{
nScore += 3;
}
// -- Mixed case letters, numbers, and characters
if (nNumberCount != 0 && nUpperCount != 0 && nLowerCount != 0 && nCharacterCount != 0)
{
nScore += 5;
}

return nScore;
}

// Runs password through check and then updates GUI
function runPassword(strPassword, strFieldID)
{
// Check password
var nScore = checkPassword(strPassword);

// Get controls
var ctlBar = document.getElementById(strFieldID + "_bar");
var ctlText = document.getElementById(strFieldID + "_text");
if (!ctlBar || !ctlText)
return;

// Set new width
ctlBar.style.width = nScore + "%";

// Color and text
// -- Безупречный
if (nScore >= 90)
{
var strText = "Отличный пароль! Главное не забыть его :)";
var strColor = "#0ca908";
}
// -- Очень хороший
else if (nScore >= 80)
{
var strText = "Очень хороший";
vstrColor = "#7ff67c";
}
// -- Хороший
else if (nScore >= 70)
{
var strText = "Хороший";
var strColor = "#1740ef";
}
// -- Давольно нормальный
else if (nScore >= 60)
{
var strText = "Достаточно неплохо";
var strColor = "#5a74e3";
}
// -- Нормальный
else if (nScore >= 50)
{
var strText = "Нормально";
var strColor = "#e3cb00";
}
// -- Слабый
else if (nScore >= 25)
{
var strText = "Слабенько";
var strColor = "#e7d61a";
}
// -- Очень плохой
else
{
var strText = "Ужас. (qwerty и то лучше :)) ";
var strColor = "#e71a1a";
}
ctlBar.style.backgroundColor = strColor;
ctlText.innerHTML = "<span style='color: " + strColor + ";'>" + strText + " - " + nScore + "</span>";
}

// Checks a string for a list of characters
function countContain(strPassword, strCheck)
{
// Declare variables
var nCount = 0;

for (i = 0; i < strPassword.length; i++)
{
if (strCheck.indexOf(strPassword.charAt(i)) > -1)
{
nCount++;
}
}

return nCount;
}

</script>
<table class="ttable" width="100%" align="center" border="0" cellpadding="4">

<tbody><tr>
<td colspan="2" bgcolor="#d4d0c8"><strong>Проверка надежности пароля
</strong></td>

</tr>

</tbody></table>
<script type="text/javascript" src="java_password.js"></script>
<table> <tbody><tr><td class="tdr">Введите Ваш пароль<span class="bred">*</span></td>

<td class="tdl"><input name="street" size="40" onkeyup="runPassword(this.value, 'mypassword');" type="text"></td>
</tr><tr> <td class="tdr">Качество пароля<span class="bred">*</span></td>
<td class="tdl"><b></b><div id="mypassword_text"><b></b></div>
<div style="width: 100px;">
<div id="mypassword_bar" style="border: 1px solid white; font-size: 1px; height: 2px; width: 0px;"></div></div></td>
</tr>
</tbody></table>